From 256cb0b0d58a20749fb900c137d19deefb9b31e1 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Sat, 13 Jan 2018 17:50:55 -0500
Subject: [PATCH] start with SDL2 OpenGL3 template

---
 .gitignore            |  1 +
 Makefile              | 21 +++++++++++
 sdl-game-controller.c | 82 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 104 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 sdl-game-controller.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5d668b3
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/sdl-game-controller
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..47962f8
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,21 @@
+FILE := sdl-game-controller
+TARGET := $(FILE)
+
+CFLAGS := $(shell pkg-config --cflags sdl2)
+ifeq (MINGW,$(findstring MINGW,$(shell uname)))
+LIBS := -lopengl32 -lglu32 -lmingw32
+CC := mingw32-gcc
+TARGET := $(TARGET).exe
+else
+LIBS := -lGL -lGLU `pkg-config --libs sdl2`
+endif
+LDFLAGS := $(LIBS) $(shell pkg-config --libs sdl2)
+
+
+all:	$(TARGET)
+
+$(TARGET): $(FILE).c
+	$(CC) -o $(TARGET) $(CFLAGS) $< $(LDFLAGS)
+
+clean:
+	-rm -f $(TARGET) *~ *.o
diff --git a/sdl-game-controller.c b/sdl-game-controller.c
new file mode 100644
index 0000000..27f7508
--- /dev/null
+++ b/sdl-game-controller.c
@@ -0,0 +1,82 @@
+#include <SDL.h>
+#include <GL/gl.h>
+#include <GL/glu.h>
+#include <stdio.h>
+
+#define WIDTH   500
+#define HEIGHT  500
+
+void init(void)
+{
+    glClearColor (0.0, 0.0, 0.0, 0.0);
+    glEnable(GL_DEPTH_TEST);
+    glShadeModel(GL_FLAT);
+    glViewport(0, 0, WIDTH, HEIGHT);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glOrtho(-0.5, WIDTH - 0.5, -0.5, HEIGHT - 0.5, -1, 1);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+}
+
+void display(SDL_Window * window)
+{
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glColor3f(1, 1, 1);
+    glBegin(GL_QUADS);
+        glVertex3f(10, HEIGHT / 2, 0.0);
+        glVertex3f(10, 3 * HEIGHT / 4, 0.0);
+        glVertex3f(WIDTH / 2, 3 * HEIGHT / 4, 0.0);
+        glVertex3f(WIDTH / 2, HEIGHT / 2, 0.0);
+    glEnd();
+    glColor3f(1, 0.6, 0);
+    glBegin(GL_LINE_LOOP);
+        glVertex2f(0, 0);
+        glVertex2f(WIDTH - 1, 0);
+        glVertex2f(WIDTH - 1, HEIGHT - 1);
+        glVertex2f(0, HEIGHT - 1);
+    glEnd();
+    SDL_GL_SwapWindow(window);
+}
+
+int main(int argc, char *argv[])
+{
+    if (SDL_Init(SDL_INIT_VIDEO))
+    {
+        printf("Failed to initialize SDL!\n");
+        return 1;
+    }
+
+    atexit(SDL_Quit);
+
+    SDL_Window * window = SDL_CreateWindow(argv[0],
+                                           SDL_WINDOWPOS_UNDEFINED,
+                                           SDL_WINDOWPOS_UNDEFINED,
+                                           WIDTH,
+                                           HEIGHT,
+                                           SDL_WINDOW_OPENGL);
+    if (!window)
+    {
+        printf("Failed to create window!\n");
+        SDL_Quit();
+        return 2;
+    }
+
+    SDL_GLContext gl_context = SDL_GL_CreateContext(window);
+
+    init();
+    display(window);
+    SDL_Event event;
+    while (SDL_WaitEvent(&event))
+    {
+        if (event.type == SDL_QUIT)
+            break;
+        else if (event.type == SDL_KEYDOWN)
+        {
+            if (event.key.keysym.sym == SDLK_ESCAPE)
+                break;
+            if (event.key.keysym.sym == SDLK_RETURN)
+                display(window);
+        }
+    }
+}